Citrus Variegated Chlorosis

Dr. John Hartung

Detection of the pathogen Xylella fastidiosa in single leaf petioles and in single insect vectors, Oncometopia nigricans.

 

Symptoms of Citrus Variegated Chlorosis disease, caused by the Gram negative bacterium Xyllella fastidiosa, on a sweet orange tree. In addition to the bright chlorosis, the disease also causes stunting and dramatic yield losses.